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The Environmental Features of the Monte Corchia Cave System (Apuan Alps, Central Italy) and Their Effects on Speleothem Growth

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The Environmental Features of the Monte Corchia Cave System (Apuan Alps, Central Italy) and Their Effects on Speleothem Growth International Journal of Speleology 37 (3) 153-172 Bologna (Italy) October 2008 Available online at www.ijs.speleo.it International Journal of Speleology Official Journal of Union Internationale de Spéléologie The environmental features of the Monte Corchia cave system (Apuan Alps, central Italy) and their effects on speleothem growth Piccini L. 1, Zanchetta G. 2,8, Drysdale R.N. 3, Hellstrom J. 4, Isola I. 5, Fallick A.E. 6, Leone G. 7, Doveri M. 8, Mussi M. 8, Mantelli F. 9, Molli G. 2, Lotti L. 10, Roncioni A. 11, Regattieri E. 11, Meccheri M. 12, Vaselli L. 13 Abstract: Piccini L., Zanchetta G., Drysdale R.N., Hellstrom J., Isola I., Fallick A.E., Leone G., Doveri M., Mussi M., Mantelli F., Molli G., Lotti L., Roncioni A., Regattieri E., Meccheri M. and Vaselli L. 2008. The environmental features of the Monte Corchia cave system (Apuan Alps, Central Italy) and their effects on speleothem growth. International Journal of Speleology, 37(3), 153-172. Bologna (Italy). ISSN 0392-6672. The Monte Corchia cave system, one of the most famous and popular caves in Italy, has in recent times been the subject of investigation on its speleothems as paleoclimate archives. This paper describes the geology, geomorphology and water chemistry of the cave system with the aim to elucidate the processes that have generated these speleothems and the properties they contain that are so useful for paleoclimatology. Some general conclusions can be drawn: i) the Corchia system is a cave developed over different altitudes during progressive uplift of the mountain chain in which it is located, probably under drainage conditions very different to those of the present. This has allowed the development of a large (ca. 60 km) and deep (-1187 m) karst system; ii) the dewatering phases have left the deepest chambers far away from clastic input and with long drip pathways; iii) the peculiar geological context has permitted the water to intercept and dissolve a significant source of U (still unknown) that facilitates radiometric dating; iv) in the last 1 Ma at least, no significant changes have occurred in the relief and in the epikarst, in the sense that speleothems have grown under very similar conditions. In addition the extremely low Ca concentration of drip waters have permitted low speleothem growth rates and, at least for the “Galleria delle Stalattiti”, the zone under paleoclimate studies, a stable plumbing system (i.e. chemistry and stable isotopes of drip waters) has produced calcite close to isotopic equilibrium. Keywords: speleothems, karst geomorphology, cave water chemistry, Corchia cave system, Apuan Alps, Central Italy. Received 12 February 2008; Revised 23 July 2008; Accepted 28 July 2008 INTRODUCTION deepest in the world at that time. In the second half Discovered on 11 October 1840 by Emilio Simi, a local of the last century, thanks to its relevant development naturalist, the Monte Corchia cave system has long and depth, the Monte Corchia Cave attracted hundreds been one of the most famous and popular caves of Italy. of speleologists from Italy and abroad. In the 1980s Initial surveying of the cave dates to the second half of the collaboration and, at times, the competition among the 19th century, but serious exploration began only at several Italian caving groups allowed the exploration of the beginning of the 20th century. In 1934, cavers from about 60 km of cave passages, thanks to the connection Florence attained what they believed to be the bottom of different caves belonging to the same karst system, of the cave, at about 540 m below the entrance, the with the depth reaching 1187 m. 1 Dipartimento di Scienze della Terra, University of Firenze, 7 Dipartimento dell’Uomo e dell’Ambiente, University of Pisa, Via la Pira 4, 50121 Firenze, Italy. Via delle Belle Torri 18, 56127 Pisa. E.mail: [email protected]. 8 Istituto di Geoscienze e Georisorse, Area della Ricerca CNR di 2 Dipartimento di Scienze della Terra, University of Pisa, Via S. Pisa, Via G. Moruzzi 1, 56124 Pisa. Maria 53, 56126 Pisa, Italy. 9 Agenzia Regionale per la protezione Ambientale della Toscana 3 School of Environmental and Life Sciences, University of (ARPAT) – Dipartimento Provinciale di Firenze. Newcastle, Callaghan, NSW 2308, Australia. 10 Agenzia Regionale per la protezione Ambientale della 4 School of Earth Sciences, University of Melbourne, Parkville, Toscana (ARPAT) – Dipartimento Provinciale di Massa. Victoria 3010, Australia. 11 Gruppo Speleologico Lucchese, Lucca Italy. 5 Istituto Nazionale di Geofisica e Vulcanologia, Sez. di Pisa 12 Dipartimento di Scienze della Terra, University of Siena, via Via della Faggiola, 32, 56100 Pisa. Laterina 8, I-53100 Siena, Italy 6 Scottish Universities Environmental Research Centre, East 13 Istituto di Geoscienze e Georisorse, UO Pisa, Via S. Maria Kilbride, Scotland. 53, I-56126 Pisa Italy. 154 Leonardo Piccini et al. The Monte Corchia massif, which hosts the entire GEOGRAPHICAL AND GEOLOGICAL cave complex, is a site of historical and modern FRAMEWORK marble exploitation. It is part of the vast district of the Alpi Apuane, which has yielded some of the Location and geographic framework most famous ornamental marbles in the world. Monte Corchia is located in the south-western part Marble exploitation, speleological activity and cave of the Alpi Apuane (NW Tuscany, Italy), a mainly preservation have never quite found a complete calcareous mountain range about 50 km long, 20 equilibrium. km wide and up to 1947 m high (Fig. 1). The alpine- In the recent past (1985), the area of Monte like landscape of this peculiar region is due to Corchia has been included in the Alpi Apuane several factors. In particular, the complex structural Regional Park and on 4 August 2001 part of the cave setting, characterized by very steep bedding and the system was opened to the public after three years of tectonic repetition of different rocks (mainly limestone construction work. The opening of the tourist cave and phyllite), has enhanced the role of differential has not completely cooled the struggles between erosion. the defenders of this natural heritage and “the The present topography is presumed to be the result quarrymen”, but it has shown that local economic of heavy fluvial erosion accompanied by rapid tectonic benefits can arise from using this landscape without uplift during the Early Pleistocene (Piccini et al., 2003; the need to extract marble. Bartolini, 2003). Glacial and periglacial processes The Federazione Speleologica Toscana (Tuscan reshaped the landscape mainly during the last two Speleological Federation) understood the new glacial stages, emphasising the “alpine-like” features potential of easier accessibility to the cave, and of this mountain range (Braschi et al., 1986). has logistically and economically supported (since A large part of the Alpi Apuane consists of carbonate 1998) palaeoclimate research using speleothems. rocks. Despite this, only a few large-scale karst The ongoing research has demonstrated that a new landforms occur, while medium and small-scale scientific “adventure” has now begun (e.g. Drysdale landforms are widely represented. The present effects et al., 2004, 2005, 2007; Zanchetta et al., 2005, of karst processes on the landscape are limited, since 2007). the high relief enhances the role of physical degradation The potential of this cave for paleoclimatological by running waters and cryogenic processes along studies is huge. Data so far obtained suggest that it the higher ridges. On the contrary, in the past a would be possible to obtain a continuous record as subdued relief has permitted the development of a far back as 1,5 Ma from stalagmites and flowstones more advanced exokarst and of large cave systems; (e.g. Woodhead et al., 2006) using U/Th, U/U and therefore, most of the major karst landforms and U/Pb systematics. The stalagmites so far studied caves are relict forms (Piccini, 1998). have preserved in their oxygen isotope composition a detailed record of past climatic changes, Local climate which mimics the sea-surface temperature over The Alpi Apuane is one of the rainiest areas in the Western Mediterranean and North Atlantic Europe. Mean annual rainfall exceeds 2500 mm over (Drysdale et al., 2004, 2005, 2007). a large part of the chain and on the central ridges it The δ18O values of calcite usually increase is more than 3000 mm/yr (Rapetti & Vittorini, 1994; during colder periods and decrease during warmer Piccini et al., 1999). The Corchia area is surrounded and wetter phases, probably due to the effects of by six official meteorological stations, located at the changes in precipitation amount (the so called villages of Retignano, Terrinca, La Polla, Campagrina, “amount effect”). Growth rate is an additional Isola Santa and Fornovolasco (Fig. 1). Table 1 shows climate proxy for these speleothems in its own the long-term mean precipitation in these localities; right (Drysdale et al., 2007), mirroring δ18O time Campagrina, very close to Monte Corchia, has a mean series. The δ13C of Corchia speleothems seems to annual precipitation of 3055 mm, one of the highest record climatic perturbations superimposed over values in Italy. soil evolution above the caves, usually correlating Monte Corchia is part of the main drainage divide, positively with δ18O during cold excursions. During which separates rivers flowing to the coastline of the transition from a glacial to an interglacial, Mar Ligure from those flowing to the interior basin there is an interesting lag observable, probably Elevation
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